I have the impression that it's useful to you to see how often the state
hack trips people up, so I've added some more comments to
http://hackage.haskell.org/trac/ghc/ticket/2284
...about how it bit me.
This is a real headache. To be frank, controlling lazy evaluation and
sharing to get the right complexity for your code can be hard enough at
the best of times, without the compiler sometimes ignoring the sharing
you try to ask for...
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